I am not very familiar the Berwick's land in and near the present day town of Berwick. I do know the location of all Joseph's grants and purchases before 1830, but did not follow in that area after that. Know much more about the Berwick lands near Centerville and south of there on Bayou Salle. The town of Berwick office may have maps and/or abstracts that show each annexation into the city limits. Otherwise, an historical abstract of the property you are interested in would have to be done. Good luck!
M.Luke, Franklin, LA